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[PATCH] libata CHS: LBA28/LBA48 optimization (revise #6)

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- add lba_28_ok() and lba_48_ok() to ata.h.
     - check ending block number instead of staring block number.
     - use lba_28_ok() for CHS range check
     - LBA28/LBA48 optimization

Suggested by Mark Lord and Alan Cox.

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>

=====
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Albert Lee
2005-10-12 15:12:26 +08:00
committed by Jeff Garzik
parent 59a10b172f
commit c6a33e2464
2 changed files with 33 additions and 27 deletions
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12
include/linux/ata.h
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@@ -291,4 +291,16 @@ static inline int ata_ok(u8 status)
== ATA_DRDY);
}
static inline int lba_28_ok(u64 block, u32 n_block)
{
/* check the ending block number */
return ((block + n_block - 1) < ((u64)1 << 28)) && (n_block <= 256);
}
static inline int lba_48_ok(u64 block, u32 n_block)
{
/* check the ending block number */
return ((block + n_block - 1) < ((u64)1 << 48)) && (n_block <= 65536);
}
#endif /* __LINUX_ATA_H__ */